package cn.tedu.sp06.filter;

import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.netflix.zuul.filters.support.FilterConstants;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;

@Component
public class AccessFilter extends ZuulFilter {
    //设置过滤器的类型   : pre(前置)  routing(路由)   post(后置)   error(错误)
    @Override
    public String filterType() {
        //eturn "pre";
        return FilterConstants.PRE_TYPE;
    }

    //位置序号
    @Override
    public int filterOrder() {
        return 6;
    }

    //判断针对当前请求,是否执行过滤代码
    @Override
    public boolean shouldFilter() {
        /**
         * 调用商品判断权限
         * 调用用户和订单,不检查权限
         */

        //获得调用的服务id
        RequestContext ctx = RequestContext.getCurrentContext();
        Object serviceId = (String)ctx.get(FilterConstants.SERVICE_ID_KEY);
        return "item-service".equals(serviceId);
    }

    //过滤代码
    @Override
    public Object run() throws ZuulException {

        //获得request对象
        RequestContext ctx = RequestContext.getCurrentContext();
        HttpServletRequest request = ctx.getRequest();
        //接收token 参数
        String token = request.getParameter("token");
        //如果没有token,阻止继续访问,直接返回响应
        if (StringUtils.isBlank(token)){
            //阻止继续访问
            ctx.setSendZuulResponse(false);
            //直接返回响应
            ctx.addZuulResponseHeader("Content-Type",
                                    "text/html;charset=UTF-8");
            ctx.setResponseBody("Not Login ! 未登录 !");
        }
        //返回值不起任何作用,返回任何数据都行
        return null;
    }
}
